Incident Overview
A pilot encountered an engine problem while in level cruise flight at an altitude of 17,000 feet. The incident began when the pilot noticed an unusual change in cabin sound. All cockpit instrument readings remained normal except for a drop in manifold pressure from 32 to 25 inches. Shortly thereafter, the engine began to sputter and run rough. The oil pressure warning light blinked and oil pressure decreased. The pilot then observed fire emanating from the cowl vents. Oil covered the windshield, rendering forward visibility impossible.
Emergency Actions
In response to the deteriorating situation, the pilot executed a forced landing. The landing was made in an open field and was successful.
Post-Inspection Findings
Following the incident, the engine was disassembled for examination. The inspection revealed that the No. 2 fuel nozzle was flowing lean. The No. 2 piston was burned. Additionally, there was evidence of crankshaft oil starvation.